(script) add web component build

Author: antoine92190

package.json

@@ -26,6 +26,7 @@
 		"serve": "vue-cli-service serve",
 		"build": "vue-cli-service build",
 		"build:lib": "vue-cli-service build --target lib --name vue-advanced-chat ./src/ChatWindow/index.js",
+		"build:wc": "vue-cli-service build --target wc --name vue-advanced-chat ./src/ChatWindow/index.js",
 		"prepublish": "npm run build:lib",
 		"publish-beta": "npm publish --tag beta",
 		"lint": "vue-cli-service lint"